On Sat, Feb 2, 2013 at 5:29 PM, Alexandre Courbot <[email protected]> wrote:
> Parse the list of chips to find the descriptor corresponding to a GPIO > number instead of directly picking the entry of the global gpio_desc[] > array, which is due to be removed. > > This turns the complexity of converting a GPIO number into a descriptor > from O(1) to O(n) where n is the number of GPIO chips in the system. > Since n is ought to be small anyway, there should be no noticeable > performance impact. Moreover, GPIO users who care for speed already have > implemented their own gpio_get_value() and gpio_set_value() with a > fast path for the GPIO numbers that matter and this change does not > affect such use cases. > > The descriptor-based GPIO API, due to be introduced soon, will make this > lookup unnecessary. > > Signed-off-by: Alexandre Courbot <[email protected]> OK it's a nice stepping stone. Reviewed-by: Linus Walleij <[email protected]> Yours, Linus Walleij -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
